Intramolecular coupling study of the resonances in the four-wave mixing signal

The effect of the intramolecular coupling on the resonances associated to t he Four-wave mixing signal is studied in the present contribution. The tran sition and permanent dipole moments are critical quantities for this analys is of the local macroscopic polarization in the adiabatic representation wh en the rotating wave approximation is not considered. New characteristics o f the resonance, emerging as a consequence of the vibronic coupling, are st udied here in the framework of a local homogeneous-linewidth third-order pe rturbation model. (C) 2000 Published by Elsevier Science B.V. All rights re served.